SN95 Mustang clarifications needed?

[MHISSTC]

What was the topic again..... ?

 

 

great discussion though

[cmc79]

I don't consider that class a success. You seem to. As I said, 5.2 car per class does not eqaul success to me. HC is also only big on the west coast if I recall.

23 cars in CMC at the 2006 Nats is a success. For 2012, I hope we can equal that.

 

Not a success?

26 drivers this year at Nat's. And you point out CMC's greatest number was 23... five years ago.

 

I see only two drivers (of 26) from CA signed up.

[cmc79]

Would ST or GTS be a better example?

38 ST/SU drivers at Nat's in three classes.

62 GTS drivers in six classes.

[Glenn]

I don't consider that class a success. You seem to. As I said, 5.2 car per class does not eqaul success to me. HC is also only big on the west coast if I recall.

23 cars in CMC at the 2006 Nats is a success. For 2012, I hope we can equal that.

 

Not a success?

26 drivers this year at Nat's. And you point out CMC's greatest number was 23... five years ago.

 

I see only two drivers (of 26) from CA signed up.

 

The HC 26 were/are spread across 5 HC classes. The CMC 23 of 2006 were in 1 class. That is a big difference.

I didn't realize HC was so populare in other regions. I havebeen corrected.

[Glenn]

Would ST or GTS be a better example?

38 ST/SU drivers at Nat's in three classes.

62 GTS drivers in six classes.

 

Sounds good to me. Thats is double the number per class than the HC one you presented.

[TurboShortBus]

Depends on where you get your info from. The 4.6 PI motors were already 9.5-9.7:1 and the head swap takes them to 10.25-10.5:1 from the info I've seen on the net.

Given the following from Sean Hyland's book:

3.540" stroke

3.551" cylinder bore

0.036" compressed head gasket thickness

3.620" head gasket bore diameter

0.008" deck clearance

 

51 cc 1992-1998 2V heads

42 cc 1999-2004 2V PI heads

52 cc 1993-2004 4V heads

 

11 cc 1992-1998 2V piston dish

17 cc 1999-2004 2V PI piston dish

3 cc 1993-2004 4V piston dish (may not be accurate)

 

And using this calculator: http://www.csgnetwork.com/compcalc.html

 

The compression ratio calculations for Ford 4.6L engines are:

1992-1998 2V, stock (11 cc dish, 51 cc) = 9.28

1999-2004 2V PI, stock (17 cc dish, 42 cc) = 9.66

1993-up 4V, stock (3 cc dish, 52 cc) = 10.21 (does not agree with 9.85 CR listed in specs)

 

1992-1998 2V bottom end (11 cc dish) + 1999-2004 2V PI heads (42 cc) = 10.52

1999-2004 2V bottom end (17 cc dish) + 1992-1998 2V heads (51 cc) = 8.62

 

1993-up 4V bottom end (3 cc dish) + 1992-1998 2V heads (51 cc) = 10.36

1993-up 4V bottom end (3 cc dish) + 1999-2004 2V PI heads (42 cc) = 11.97

 

But, recalculating per different numbers found at Sullivan Performance's website gives you:

1992-1998 2V, stock (10.49 cc dish, 52 cc) = 9.22

1999-2004 2V PI, stock (18.10 cc dish, 44 cc) = 9.26

1993-1998 4V, stock (2.66 cc dish, no chamber volume listed) = ?

1999-2002 4V, stock (4.54 cc dish, no chamber volume listed) = ?

 

1992-1998 2V bottom end (10.49 cc dish) + 1999-2004 2V PI heads (44 cc) = 10.28

1999-2004 2V bottom end (18.10 cc dish) + 1992-1998 2V heads (52 cc) = 8.41

 

1993-1998 4V bottom end (2.66 cc dish) + 1992-1998 2V heads (52 cc) = 10.26

1993-1998 4V bottom end (2.66 cc dish) + 1999-2004 2V PI heads (44 cc) = 11.63

 

1999-2001 4V bottom end (4.54 cc dish) + 1992-1998 2V heads (52 cc) = 9.98

1999-2001 4V bottom end (4.54 cc dish) + 1999-2004 2V PI heads (44 cc) = 11.27

 

So, these numbers can be all over the place, depending on whose information you use.

 

Mark

[Glenn]

Depends on where you get your info from. The 4.6 PI motors were already 9.5-9.7:1 and the head swap takes them to 10.25-10.5:1 from the info I've seen on the net.

Given the following from Sean Hyland's book:

3.540" stroke

3.551" cylinder bore

0.036" compressed head gasket thickness

3.620" head gasket bore diameter

0.008" deck clearance

 

51 cc 1992-1998 2V heads

42 cc 1999-2004 2V PI heads

52 cc 1993-2004 4V heads

 

11 cc 1992-1998 2V piston dish

17 cc 1999-2004 2V PI piston dish

3 cc 1993-2004 4V piston dish (may not be accurate)

 

And using this calculator: http://www.csgnetwork.com/compcalc.html

 

The compression ratio calculations for Ford 4.6L engines are:

1992-1998 2V, stock (11 cc dish, 51 cc) = 9.28

1999-2004 2V PI, stock (17 cc dish, 42 cc) = 9.66

1993-up 4V, stock (3 cc dish, 52 cc) = 10.21 (does not agree with 9.85 CR listed in specs)

 

1992-1998 2V bottom end (11 cc dish) + 1999-2004 2V PI heads (42 cc) = 10.52

1999-2004 2V bottom end (17 cc dish) + 1992-1998 2V heads (51 cc) = 8.62

 

1993-up 4V bottom end (3 cc dish) + 1992-1998 2V heads (51 cc) = 10.36

1993-up 4V bottom end (3 cc dish) + 1999-2004 2V PI heads (42 cc) = 11.97

 

But, recalculating per different numbers found at Sullivan Performance's website gives you:

1992-1998 2V, stock (10.49 cc dish, 52 cc) = 9.22

1999-2004 2V PI, stock (18.10 cc dish, 44 cc) = 9.26

1993-1998 4V, stock (2.66 cc dish, no chamber volume listed) = ?

1999-2002 4V, stock (4.54 cc dish, no chamber volume listed) = ?

 

1992-1998 2V bottom end (10.49 cc dish) + 1999-2004 2V PI heads (44 cc) = 10.28

1999-2004 2V bottom end (18.10 cc dish) + 1992-1998 2V heads (52 cc) = 8.41

 

1993-1998 4V bottom end (2.66 cc dish) + 1992-1998 2V heads (52 cc) = 10.26

1993-1998 4V bottom end (2.66 cc dish) + 1999-2004 2V PI heads (44 cc) = 11.63

 

1999-2001 4V bottom end (4.54 cc dish) + 1992-1998 2V heads (52 cc) = 9.98

1999-2001 4V bottom end (4.54 cc dish) + 1999-2004 2V PI heads (44 cc) = 11.27

 

So, these numbers can be all over the place, depending on whose information you use.

 

Mark

 

Very nice work!